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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.solr.core;

import static org.apache.solr.common.params.CommonParams.DISTRIB;

import java.lang.invoke.MethodHandles;
import java.util.ArrayList;
import java.util.List;
import org.apache.solr.common.params.CommonParams;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.request.LocalSolrQueryRequest;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.request.SolrRequestInfo;
import org.apache.solr.response.ResultContext;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.search.DocIterator;
import org.apache.solr.search.DocList;
import org.apache.solr.search.SolrIndexSearcher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/** */
public class QuerySenderListener extends AbstractSolrEventListener {
  private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());

  public QuerySenderListener(SolrCore core) {
    super(core);
  }

  @Override
  public void newSearcher(SolrIndexSearcher newSearcher, SolrIndexSearcher currentSearcher) {
    final SolrIndexSearcher searcher = newSearcher;
    log.debug("QuerySenderListener sending requests to {}", newSearcher);
    @SuppressWarnings("unchecked")
    List> allLists =
        convertQueriesToList((ArrayList) getArgs().getAll("queries"));
    if (allLists == null) return;
    for (NamedList nlst : allLists) {
      try {
        // bind the request to a particular searcher (the newSearcher)
        NamedList params = addEventParms(currentSearcher, nlst);
        // for this, we default to distrib = false
        if (params.get(DISTRIB) == null) {
          params.add(DISTRIB, false);
        }
        SolrQueryRequest req =
            new LocalSolrQueryRequest(getCore(), params) {
              @Override
              public SolrIndexSearcher getSearcher() {
                return searcher;
              }

              @Override
              public void close() {}
            };
        SolrQueryResponse rsp = new SolrQueryResponse();
        SolrRequestInfo.setRequestInfo(new SolrRequestInfo(req, rsp));
        try {
          getCore()
              .execute(getCore().getRequestHandler(req.getParams().get(CommonParams.QT)), req, rsp);

          // Retrieve the Document instances (not just the ids) to warm
          // the OS disk cache, and any Solr document cache.  Only the top
          // level values in the NamedList are checked for DocLists.
          NamedList values = rsp.getValues();
          for (int i = 0; i < values.size(); i++) {
            Object o = values.getVal(i);
            if (o instanceof ResultContext) {
              o = ((ResultContext) o).getDocList();
            }
            if (o instanceof DocList) {
              DocList docs = (DocList) o;
              for (DocIterator iter = docs.iterator(); iter.hasNext(); ) {
                newSearcher.doc(iter.nextDoc());
              }
            }
          }
        } finally {
          try {
            req.close();
          } finally {
            SolrRequestInfo.clearRequestInfo();
          }
        }
      } catch (Exception e) {
        // do nothing... we want to continue with the other requests.
        // the failure should have already been logged.
      }
    }
    log.info("QuerySenderListener done.");
  }

  protected static List> convertQueriesToList(ArrayList queries) {

    List> allLists = new ArrayList>();

    for (Object o : queries) {
      if (o instanceof ArrayList) {
        // XML config from solrconfig.xml triggers this path
        for (Object o2 : (ArrayList) o) {
          if (o2 instanceof NamedList) {
            @SuppressWarnings("unchecked")
            NamedList o3 = (NamedList) o2;
            allLists.add(o3);
          } else {
            // this is triggered by unexpected  elements
            // (unexpected  is ignored)
            // also by nested lists in JSON from Config API
            log.warn("ignoring unsupported warming config ({})", o2);
          }
        }
      } else if (o instanceof NamedList) {
        // JSON config from Config API triggers this path
        @SuppressWarnings("unchecked")
        NamedList o3 = (NamedList) o;
        allLists.add(o3);
      } else {
        // NB different message format to above so messages can be differentiated
        log.warn("ignoring unsupported warming config - {}", o);
      }
    }

    return allLists;
  }
}
 















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